HR: 1340h
AN: OS43A-0534    [Abstracts]
TI: MEDFLUX: Organic Biomarkers in Time-Series and Sinking-Velocity Traps
AU: * Wakeham, S
EM: stuart@skio.peachnet.edu
AF: Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, GA 31411 United States
AU: Lee, C
EM: Cindy.Lee@ notes.cc.sunysb.edu
AF: SUNY at Stony Brook, Marine Science Research Center, Stony Brook, NY 11794 United States
AU: Peterson, M
EM: mlpmlp@u.washington.edu
AF: University of Washington, Department of Oceanography, Seattle, WA 98195 United States
AU: Miquel, J
EM: j.c.miquel@iaea.org
AF: International Atomic Energy Agency, 4 Quai Antoine 1 er, Monaco, MC 98012 Monaco
AU: Liu, Z
EM: zhanfei.liu@msrc.sunysb.edu
AF: SUNY at Stony Brook, Marine Science Research Center, Stony Brook, NY 11794 United States
AU: Xue, J
EM: jianhong.xue@msrc.sunysb.edu
AF: SUNY at Stony Brook, Marine Science Research Center, Stony Brook, NY 11794 United States
AU: Askea, M
EM: measkea7@yahoo.com
AF: Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, GA 31411 United States
AU: Putnam, I
EM: putnam@skio.peachnet.edu
AF: Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, GA 31411 United States
AB: During a recent field experiment at the French JGOFS DYFAMED site in the western Mediterranean, we collected sinking particles using conventional time-series traps and a trap modified to fractionate particles in-situ as a function of their sinking velocity. Our goal was to characterize the in-situ sinking nature of particles, followed by analysis of their chemical composition to evaluate relationships between organic matter, mineral ballast, sinking, and decomposition. Analyses of lipids and amino acids in these trap samples and application of multivariate analysis to compound distributions separates trap samples dominated by fresh diatom-derived organic matter from those that contain substantial amounts of OM that has been reworked by zooplankton and bacteria. The majority of particles were observed to sink at 200-500 m/d and were dominated by large diatom-derived aggregates that were delivered primarily during the spring bloom period. The more slowly sinking particles carry with them a greater zooplankton and bacterial signature.
DE: 1050 Marine geochemistry (4835, 4850)
DE: 1055 Organic geochemistry
DE: 1094 Instruments and techniques
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting